MSM7584C Просмотр технического описания (PDF) - Oki Electric Industry
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MSM7584C Datasheet PDF : 57 Pages
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¡ Semiconductor
MSM7584C
SGCT, SGCR
Outputs for CODEC analog signal ground.
The output voltage is approximately 1.4 V. Insert 10 mF and 0.1 mF bypass capacitors (ceramic
type) between these pins and the AG pin. When the device is in power down mode, the output
is 0 V.
SGCT is used for transmitting and SGCR is for receiving.
AGC
ADPCM CODEC analog ground (0 V).
DGC
ADPCM CODEC digital ground (0 V).
Since this pin is internally separated from AGC and AGM (modem ground pin), this pin must
be connected to these pins as close as possible on the circuit board.
VDDC
ADPCM CODEC 3 V power supply.
Connect this pin to the MODEM power Supply VDDM.
PDN3
ADPCM CODEC power down control input.
When this pin is set to "0" level, the device enters power down mode.
During normal operation mode, set this pin to "1" level.
The power down mode is controlled by CR0 - B5 of the control register ORed with the signal from
the PDN3 pin. Therefore, when using this pin, set CR0 - B5 to digital "0".
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